Group page of Quantum Photonics Laboratory @ FUW

Our research


We research the potential of spectral-temporal encoding for the processing of quantum information. Our interests include experimental implementations of multidimensional quantum-enhanced metrology. We explore highly efficient, fiber-compatible quantum cryptography protocols. We look for applications of time-energy entanglement.


We experimentally investigate methods for coherent modification of spectro-temporal mode structure of optical pulses at the single photon level. We are building highly efficient electro-optic mode converters for single-photon pulses. We explore the properties of highly dispersive optical media.

With our partners within the NLPQT consortium we are involved in building Quantum Key Distribution links in Poland, including and intericty link between Warsaw and Poznan. This activity is enabled by the nationwide academic fiber network PIONIER.


We explore applications of the concept of time lens and ultrafast all-optical information processing in the field of quantum optics. We explore new opportunities offered by these techniques for quantum information processing. We address technical challenges associated with applying these concepts to non-classical light.

Our publications

Electro-optic Fourier transform chronometry of pulsed quantum light
Ali Golestani, Alex O. C. Davis, Filip Sośnicki, Michał Mikołajczyk, Nicolas Treps, Michał Karpiński
Physical Review Letters 129, 123605 (2022).
arXiv preprint arXiv:2205.11554
Theory from Paris & Bath, experiment from Warsaw!

Aberration-corrected time aperture of an electro-optic time lens
Sanjay Kapoor, Filip Sośnicki, Michał Karpiński
arXiv preprint arXiv:2207.07618 (2022).

Control and measurement of quantum light pulses for quantum information science and technology
Michał Karpiński, Alex O. C. Davis, Filip Sośnicki, Valérian Thiel, Brian J. Smith
Advanced Quantum Technologies 4, 2000150 (2021).
Review paper.

Actuator placement optimization for guided waves based structural health monitoring using fibre Bragg grating sensors
R. Soman, K. Balasubramaniam, A. Golestani, M. Karpiński, P. M. Malinowski, W. M. Ostachowicz
Smart Mater. Struct. 30, 125011 (2021).

Aperiodic electro-optic time lens for spectral manipulation of single-photon pulses
Filip Sośnicki, Michał Mikołajczyk, Ali Golestani, Michał Karpiński
Applied Physics Letters 116, 234003 (2020) (featured article).
arXiv preprint arXiv:2004.07195 (2020).

Pure single photons from scalable frequency multiplexing
T. Hiemstra, T. F. Parker, P. Humphreys, J. Tiedau, M. Beck, M. Karpiński, B. J. Smith, A. Eckstein, W. S. Kolthammer, I. A. Walmsley
Phys. Rev. Applied 14, 014052 (2020),
arXiv preprint arXiv:1907.10355 (2020).

A two-step guided waves based damage localization technique using optical fiber sensors
R. Soman, K. Balasubramaniam, A. Golestani, M. Karpiński, P. Malinowski
Sensors 20, 5804 (2020).

Shaking the phase of light
Michał Karpiński
Nature Photonics 13, 306–308 (2019).
News&Views on the recent work from the group of H. X. Tang @ Yale.

Large-scale spectral bandwidth compression by complex electro-optic temporal phase modulation
Filip Sośnicki, Michał Karpiński
Optics Express 26, 31307–31316 (2018).

Measuring the single-photon temporal-spectral wave function
Alex O. C. Davis, Valérian Thiel, Michał Karpiński, Brian J. Smith
Phys. Rev. Lett. 121, 083602 (2018).

Experimental single-photon pulse characterization by electro-optic shearing interferometry
Alex O. C. Davis, Valérian Thiel, Michał Karpiński, Brian J. Smith
Phys. Rev. A. 98, 023840 (2018).

Engineering the spectral and temporal properties of a GHz-bandwidth heralded single-photon source interfaced with an on-demand, broadband quantum memory
Patrick S. Michelberger, Michal Karpinski, Ian A. Walmsley, Joshua Nunn
Journal of Modern Optics 65, 1668–1679 (2018).

Entanglement swapping for generation of heralded time-frequency-entangled photon pairs
Dashiell L. P. Vitullo, Michael G. Raymer, Brian J. Smith, Michal Karpinski, Lasse Mejling, Karsten Rottwitt,
Phys. Rev. A 98, 026836 (2018).

Measurement of radio-frequency temporal phase modulation with chirped optical pulses
Michal Jachura, Jan Szczepanek, Wojciech Wasilewski, Michal Karpinski
Journal of Modern Optics 65, 262–267 (2018).

Bandwidth manipulation of quantum light by an electro-optic time lens
Michal Karpinski, Michal Jachura (equal contribution), Laura J. Wright, Brian J. Smith
Nature Photonics 11, 53 (2017).
See also our press release!

Pulsed single-photon spectrograph by frequency-to-time mapping using chirped fiber Bragg gratings
Alex O. C. Davis, Paul M. Saulnier, Michal Karpinski, Brian J. Smith
Optics Express 25, 12804–12811 (2017).
Selected for Spotlight on Optics! Here’s a brief summary of our paper!

Spectral shearing of quantum light pulses by electro-optic phase modulation
Laura J. Wright, Michal Karpinski, Christoph Soeller, Brian J. Smith
Physical Review Letters 118, 023601 (2017).
arXiv:1605.00640 (2016).

Quantum mechanical which-way experiment with an internal degree of freedom
Konrad Banaszek, Pawel Horodecki, Michal Karpinski, Czeslaw Radzewicz
Nature Communications 4, 2594 (2013).
See also our press release!

The group

Who we are

We are a young dynamic group within the Optics Division of the Faculty of Physics (FUW) at the University of Warsaw (UW). FUW is a world-class physics research centre covering a broad area of physics and is the leading physics research institution in Poland. It hosts numerous groups both in optics (Ultrafast Phenomena Lab, Quantum Memories Lab, Photonic Nanostructures Facility, Information Optics Lab, Cold Atoms, Femtosecond Spectroscopy) as well as quantum information, quantum metrology, and communications theory. This gives us an ideal setting for our research.

Our Lab

We work in a state-of-the-art optical lab furnished with cutting-edge equipment. This includes a stable ultra-wide-band (up to 35 GHz) arbitrary electro-optic phase modulation setup, an aperiodic time lens, custom dispersive media (thanks to collaboration with ORC in Southampton, UK), low timing jitter superconducting single-photon-counting detectors, telecom and 1.7 – 2.1 um fs pulsed lasers, photon pair sources and a complex optical spectrum analyser for spectrum and spectral phase measurements. We appreciate the initial support of Konrad Banaszek, Czesław Radzewicz and numerous funding programmes (EU Structural Funds, National Science Centre of Poland ). Our current funding includes a QuantERA grant (together with groups in Germany, Italy, France & UK) and a project funded by the Foundation for Polish Science (FNP) First Team programme — please click here for more details! We are also part of the National Laboratory for Photonics and Quantum technologies – NLPQT infrastructural project which funded our recent equipment purchases. We have recently completed another FNP project — please click here for details.

Main Team
Summer students
Other collaborators

We’re back from the first in-person meeting of the QuantERA QuICHE project. Great 2 days at Heinrich Heine University Düsseldorf, new connections & new ideas. Thank you QuantERA, thank you QuICHE Düsseldorf team! ! To learn more about QuICHE, please click:

Best poster prize at 100th anniversary of Polish Physical Society

Filip Sośnicki won the best poster prize at the XLVI Extraordinary Congress of Polish Physicists on the 100th anniversary of the Polish Physical Society for the poster entitled “Phase-only shaping of single-photon pulses”! Please click to access the poster abstract and the poster itself. Congratulations to Filip and the other …

National Laboratory for Photonics and Quantum Technologies – NLPQT

The NLPQT infrastructural project is finally kicking off. NLPQT involves 7 Polish research institutes and more than 30 MEuro equipment funding from which 0.7 MEuro will go towars our lab. We will establish experimental testbeds for quantum communication and quantum networks. With our partners from the Poznan Supercomupting and Networking …

Contact and jobs


We are constantly looking for ambitious Postdocs, PhD, MSc and BSc students. Below you will find information about any open positions in our externally funded projects. You can also join our group by coming with your own funding, or enrolling for the MSc or PhD programmes at the University of Warsaw. Please check our coming with your own funding website for more details!

Please note the currently open POLONEZ-BIS 3 call for 2-year Marie-Sklodowska-Curie-style fellowships (Marie-Sklodowska-Curie-COFUND programme). This is a great opportunity to join our group a post doc!


We are currently looking for:

A masters-level student to work in our project on Phase-only shaping of light pulses for applications in quantum technologies, funded within the First Team programme of the Foundation for Polish Science. The task is to perform simulations of spectral-temporal modifications of optical pulses. We offer a monthly stipend of 1500 zl for up to 12 months! You may also become involved in international collaborations with our partners at LKB Paris, ORC Southampton, Saarland University and University of Innsbruck or Quandela company.

Please contact Michal Karpinski mkarp at fuw. edu. pl to learn more!

Find us

We are located at the Ochota Campus of the University of Warsaw, in the interferometrically stable basement of the Geophysics Building (room 023).
We are a short tram ride from the centre of Warsaw. The Warsaw Chopin Airport is just a 20-minute bus ride away. On sunny days we escape the darkness of the lab to enjoy the adjacent Pole Mokotowskie Park.

🏠 ul. Pasteura 7, 02-093 Warszawa, Poland
(+48) 22 55 32 740 or (+48) 22 55 46 872